Core Keeper Codex
1.2.1.5 · verified 2026-09-07

Hydra Bone Sword

Rare · item level 16

Rarity
Rare
Item level
16
Base damage
276
DPS
690.0 base ÷ cooldown
Attack cooldown
0.4s
Durability
500
Sell value
—
Stackable
No
Slot
Held
Object ID
8,974

What the damage number is, and what it is not

Base damage 276 is read straight from the game's files for this item at item level 16. It is the right figure for comparing weapons: across the sword line it rises 33 → 50 → 132 → 163 → 214 → 248 → 280.

What we do not publish is the number the game prints on the tooltip in a live world. This site briefly did, using a formula fitted to an outside source, and it was wrong — it produced almost the same value for every weapon in a tier ladder, rating a Copper Sword above a Solarite Sword. It has been withdrawn rather than quietly corrected. The full account is on the method page.

What it grants while held

StatValueMultiplier
Damage Increase Against Stunned44×4.00
Increased Damage Against Bosses15—

These are the condition values the game applies. The files do not label their units, so the raw value is shown rather than a percentage sign that might be wrong.

Where to get it

Best source is Pyrdra the Fire Titan at 32.47% per kill — about 6 kills for a 9-in-10 chance.

SourceChance per killKills for 90%AmountNote
Pyrdra the Fire Titan32.47%
61guaranteed group

Crafting

IngredientAmount
Solarite Bar24
Gleam Wood10

Crafting time 1s.

Internal name HydraBoneSword. Components: AreaLevelAuthoring CooldownAuthoring DurabilityAuthoring EntityMonoBehaviourData GivesConditionsWhenEquippedAuthoring WeaponDamageAuthoring